I've been running IPv6 for quite some time now. Maybe a decade or so. In the beginning I was using an IPv6 tunnel provided by SiXXs, but for some years now I have a native IPv6 /48 subnet. Some years ago Deutsche Telekom activated #IPv6 for their DSL customers. This boosted IPv6 traffic in Germany. But there is room for improvement as shown in this network graph to my webserver: